Carbureter.



HORACE L. MQCURDY, GF DETBGIT, MICHIGAN;V

CABBURETER.

Application led Hay 17, 1915.

To all whom it may concern.'

Be itvknown that I. HORACE L. M CQRDY, a citizen of the United States, residing at Detroit, in the county of lVayne and State.

This invention relates to carbureters for internal combustion engines, and its'object is to produce a device of this character which shall be simple in construction, which -can be sold at a' low price, and which shall provide the proper explosive mixture irrespective of the speed of the engine to which it is attached.

This invention consists in the details of construction illustrated in the vaccompanying drawings, described in the specification and particularly pointed outin the claims.

YIn the accompanying drawings, Figure l is a vertical central section of this improved carbureter. Fig. 2 is an elevation ofl the saine, showing the air inlet. Fig.' 3 is a plan on the line 3--3 of Fig. 1. Fig. 4 is a vertical central section of a modified form of carbureter. Fig. 5 is an elevation of the upper end thereof. Fig. 6 is a section through the valve chamber. Fig. 7 is a per s'pective view of the throttle valve.

. arts throughout the several views.

The body of the carbureter shown in Figs. `1,2 and 3 may be formed with flanges 1 at [its upper end to secure it to the intake passave of an internal. combustion engine. llust below the flanges 1 is a cylindrical valve chamber 2, whose lower end is closed by means of a diaphragm or head 3. Extending down from the head '3 is a cylindrical float chamber 4, to which the head 5 is secured in any desired' manner, preferably by screw threads. Connected to the hub 6 of the head 5 is a fitting 7 having a threaded opening 8, into which the ordinary fuel supply pipe may bescrewed, and also provided with a 4drain cock 9. Mounted within this itting 7 isshown ascreen or filter 1l, which may be of any desired character.

- The oat 13- is shown mounte'd on the stem 14, which stem is slidable at itsupper end in a central hole in a hub 15 pn the head 3, and at its lower end in the head 5. A valve 16 is formed on the lower end of the stem 14, or secured thereto in any desired manner-. A small tubular plug 17 in the Speeication of `Letters Yatent.

Similar reference characters refer to like Patented Nov. 9, 1915.5.

Serial No. 28,505.

lower end of .the bore 18 'of the nnb 6 per mits the fuel to flow up this bore 18, but at the same time'prevents the ioat lfrom falling a sutlicient distance to remove the upper end of the stem 14 entirely from the bore in the hub 15.

The annular space around the outside of the chamber 4 and constituting a fuelclianiber, connecten/'ith the interior thereof by means of any desired number of holes 19. Flanges 22 and 23 support the tube,24pref erably of glass, around the body 4 in such manner that the fuel may flow out through the small openin s 19 into the fuel chamber between this bp y 4 and the. tubular shell 24. The interior of the float chamber may connect with the exteriorair by means ci a passage 20.

A series of openings 26 are formed in the head 3, as indicated in Figs. 1 and 3, to permit the flow of fuel into the valve chamber from the fuel chamber between the Walls 4 and 24. Mounted within the valve charnber is a throttle valve consisting of a circular plate 29 and a cylindrical flange 30 formed 'with an opening 32 whose upper edge is inclined, as shown in Fig. 2. The plate 29 has a notch 81 as shown in Fig. 3. Secured to the plate 29 is an' arm 33, by means of which this throttle valve may be turned, and extending outthrough an opening 34 in the 'chamber 2. It will be seen that as this disk 29 is swung byI means of the arm 33, that J the openings 2,6 maybe covered or uncovered as desired. It will also be seen that, because of vthe inclined upper wall of the opening 32, the amount of air which may pass in through the openings 32 and 34 will depend entirely upon the position of the arm 33, and that as this arm is swung to the left in Fig. 2', the amount of air which may pass through the openin 32 will be out down and the change wi be greater than the reduction of the fuel supply because of the closing of the openings,2 6.

The operation of the device is simple. When the throttle valve is entirely open, 'as

shown in Fig. 2, all of the openings 26 will be open. As the opening 32 is alwayso less area than the'chamber 2,' a considerable suction will occur at the upper ends of the passages 26. This will causertheuel to pass through the openings 19 and rise in the annular fuel chamber 'between the body 4 and the shell 24. The loatwill'fall in the air inlet apertures 61 `which may be closedfloat chamber because of lthe opening20 permitting the air to rush i'n. After the-iioat has descended the properdistance, the valve 16 will be moved ot'f its vseat and fuel will flowup through the bore 18 in the hub v6 and into the'float chamber` and out through the passages 19. to the fuel chamber and passages 26. 'By swinging around the 'arm 33 the numberof these passages 26, and therefore the flow of fuel may be reduced or increased, and such change will always be lessv than the reduction oi' increase 1n area ofthe passage 32.

The spring 36 presses down' the plate 29 against the head and is in turn held, down by means of the washer 37 and the pin 38,

as shown in Fig. 1. The fuel vapor or gas passes out through the upper end of the fuel chamber.I v

Instead of controlling the'flow of the fuel to the holes 2 6 by means of a float, this structh'e carbureter extends beyond the fuel chamber 43 to form a cylindrical l valve' chamber 44 and a carburcting orl lniX.-l "$5 ing'chalnber 45,-the latter provided with perforated lugs 46 whereby the earburetcr may be secured to the intake passage of the engine. Separating the fuel chamber and the valve chamber is a head 47 having central .hubs 48 and 4S) in which the valve stemp() is slidable. VAt the lower end of the stem is a fuel-valve in the formv of fao ing formed with'a rectangularv air inlet opening and the valve with a triangular" a double cone, a lower cone to close the passage 58 in thc hub 42, and an upper cone to close the space around the st eml 50 when the valve 52 is at the upper limit of its' movement. 'A light spring 54 on the hub 49 holds the fuel-valve on' its lower seat `when the engine is-atrest.

Mounted onl thehub 4S is a throttle'valve having a bottom plate 55, two segmental {hinges-56 and an operating arm 57. `The head 47 is provided with two series of fuel apertures 5S which are arranged circum- -ferentially ofthe hub 48 'so that theyv may discharge through the notches 59 in the .plate 55. As the valve is turned, these apcrturesare closedor opened l'aslpreviously de-` scribed.

Instead of the wall. of the carbureter beopening, ras show n lin Figs. 1, 2 and 3, the valve chamber 44 is formed with triangular for great.

lows.

by meansv of the segments 56, this construction being the equ'ivalentfof the other. As

'in the ca rbure'ter first described, the air aperture will be reduced in greater propor-y tion than the reduction of. the fuel supply, thus providing a greater proportionate supply lof fuel for A positive control of the air inlet 'a'pertures 61 may be desirableto provide for changes in air conditions dueto 'differences in barometric pressures.' 'A sleeve [33' 'may be mounted on the valve chamber 44 and small throttle opening thanv have triangular apertures (34 similar to the apertures 6l in the valve chamber and slotsv 65 to receive the screws 66 onwhich this sleeve isfmoi-inted.` Ari-arm 67 may begemployed to revolve the sleeve on tliefvalve of this carl'mreter. v

chamber to' reduce orenlarge the air inlet' To o )en the fuel assafre an air valve70 C:

.may be employed, and may be mounted within the upper end of the valve chamber on the stem 50,.being normally 4held'against the shoulder 7l on this stem by means of the spring 72 and washer 73. f

The o v)eration of this carbureter islas fol- "lien vthe engine is at rest, the'valve held seated by tliespring 54a'nd the .valve 7() is positioned to nearly close the upper en'd of. the` valve chamber.

engineis being started, the su'ctionfwill lift Y the air valve and with it the fuel-valve 52,

'permitting fuel'to fiow from the passage 53 vWhen the into the fuelchamber and thence, through the apertures 58 to the valve chamber." As

.the lrush Vof air increases, the -air val-vel may be lifted still farther, the fuel-valve however stopping when it engages thelower. end of the hub 49. f

To hold the throttle valve against" the 'head 67, a spring 75 may be mounted on the hub`l48'between the 'Valvefand the collar 76.

Many changes may be made in the details of.

the constructions shown Without' departing from the spirit ofthe invention as set forth in the claims.

l. In a carbureter, the combination of a cylindrical fioat chamber having heads at its surroundingsaid chamber and forming a fluiditight' joint with said heads to constitute v a fuel chamber, said float chamber being formed with passages cannecting the fuel chamber with the interior of the iioat chamber, the upper head having passages extending from said fuel chamber, a'valve chamber connected to sai'd upperfhead and having an y upper' and lower ends, a cylindrical shell separating the chambers, an annular fuel chamber connecting to the lower end of the float chamber and extending up to said head which is formed with small passages through which the fuel may How to the valve chamber, said valve chamber having an air inlet opening and an outlet opening. and a cylindrical throttle valve fitting within the valve chamber and provided with an opening in its cylindrical wall adapted to register with the air inlet, said valve being adapted to be moved to gradually close the air inlet opening and consecutively close the fuel passages at the same time.

3. In a carbureter, the combination of a float chamber, an upper head therefor, a cylindrical valve chamber mounted on said head and having an air inlet in its Wall, said head having small fuel passages opening to the valve chamber, a fuel chamber connecting to the iioat chamber and to said fuel passages in said head, and a throttle valve mounted and fitting Within the valve chamber and comprising a circular disk having a notch to uncover the fuel passages in said head, a cylindrical ange formed with a triangular air passage, and an arm by means of which the valve may be turned to close said air and fuel passage.

4.'v In a carbureter, the combination of a vfuel chamber, a head therefor, a cylindrical valve chamber mounted on said head and having an air inlet in its Wall, said head having small fuel passages opening to the vaive chamber, means to convey fuel to said fuel chamber, and a throttle valvevmounted in the valve chamber comprising a circular disk having anotch to uncover the fuel passages in said head, a cylindrical iiange formed with an air passage, and an arm by means of which the valve may be turned to close said air and fuel passage, one of said air pasu sages being triangular said fuelpassages in the head being adjacent to the air inlet in the wall of the valve chamber so that the in coming air will immediately come into contact with the fuel, said cylindrical part of the valve fitting against the Wall of the valve chamber.

5. In a carbureter, the combination of a fuel chamber and means to feed fuel thereto, a cylindrical valve chamber above the fuel chamber 'and provided with an air inlet in its Wali, a head separating the two chambers, and a valve revolubly mounted in the valve chamber on said head and comprising a cylindrical portion fitting with in the cylindrical valve chamber and having an opening adapted to register with the air inlet, and a disk ntting against said head and having a cut away portion adjacentthe air opening, said head being formed to per mit the flow of fuel from the fuel chamber to the vvalve chamber and said valve being so mounted as to restrict said flow at a greater rate than the restriction of the air through the air inlet.

In testimony whereof I have signed this specification.

' HORACE L. MCCURDY. 

